x(x-1)-4(1-x)的平方

问题描述:

x(x-1)-4(1-x)的平方

x(x-1)-4(1-x)^2
=x(x-1)-4(x-1)^2
=(x-1)[x-4(x-1)]
=(x-1)(-3x+4)
如果您要问x(x-1)-4(1-x)^2=0
那么X1=1
X2=4/3